.body{
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    z-index: 1;
}
.background{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}
.setting{
    position: absolute;
    width: 40%;
    background-color: white;
    border-radius: 3px;
    top: 10px;
    right: 10px;
    z-index: 1;
    box-shadow: 0 2px 5px 0 rgb(0,0,0,0.3);
}
.button{
    width: 100%;
    padding: 10px;
    font-size: 17px;
}